AIX 5.2 Network adapter performance

[smtp5]

Dear AIX experts,

I hope you can give me advice on this problem.

We are currently running Lotus Domino (Web server) on AIX 5.2
Assume that all the network devices has set to 10/100 Full duplex, we noticed that uploading file to web server is 4~5 times slow then downloading from web server.

here is our confuguration of our network adapter:

ifconfig en0
en0: flags=5e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT
,64BIT,CHECKSUM_OFFLOAD,PSEG,CHAIN>
inet xxxxxxxxx netmask 0xffffff00 broadcast xxxxxxxx
tcp_sendspace 262144 tcp_recvspace 262144


Can please somebody out there explain to me what is the problem?

Thanks, Jay

 

[MoshiachNow]

HI,

Effectively this means that your server is much faster in writing to then reading from.

Normally it may mean 2 things:

1.Your disks/RAIDS have a read performance issue - this must be addresses as per their type,also the vmtune system params may need optimizatio.See chapter 4 of the following doc:

http://www.redbooks.ibm.com/pubs/pdfs/redbooks/sg246184.pdf

2.If it's a network tuning issue - see the link below.

http://publib.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixbman/prftungd/2365a83.htm

(My guess is that you may have to increase your send buffers for tcpip/udp using "no" command.)


Long live king Moshiach !

http://www.7for70.com/

 

[xinuxia]

in your /etc/rc.net, towards the bottom, add/change these:


if [ -f /usr/sbin/no ] ; then
/usr/sbin/no -o rfc1323=1
/usr/sbin/no -o tcp_sendspace=65535
/usr/sbin/no -o tcp_recvspace=65535
/usr/sbin/no -o udp_sendspace=131072
/usr/sbin/no -o udp_recvspace=131072
/usr/sbin/no -o pmtu_rediscover_interval=0
/usr/sbin/no -o udp_pmtu_discover=0
/usr/sbin/no -o tcp_pmtu_discover=0
fi

You'll have to reboot or run this script again. Either way you'll have an network outage.